linux - creating two child processes in C and execute them one after the other -

i have 2 programs program_a , program_b, called c code. program_b has executed after program_a finishes work.

i tried use fork() , execl() accomplish goal, seems program_b wont executed @ all.. can 1 give me correct structure on in order should create child processes?

you need wait first child finish, fork , execl next child.

#include <stdio.h> #include <stdlib.h> #include <unistd.h>  void die(char *msg) {     fprintf(stderr, "error: %s\n", msg);     exit(exit_failure); }  int main(void) {     pid_t pid = fork();     if (pid < 0)         die("fork a");      if (pid == 0) { // child         execl("./program_a", "program_a", (char*)0);         die("exec a");     } else {        // parent         wait(null);         pid = fork();         if (pid < 0)             die("fork b");         if (pid == 0) { // child             execl("./program_b", "program_b", (char*)0);             die("exec b");         } else {        // parent             wait(null);             printf("done.\n");         }     }      return 0; }